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1. WO2001063007 - NICKEL-GOLD PLATING EXHIBITING HIGH RESISTANCE TO CORROSION

Publication Number WO/2001/063007
Publication Date 30.08.2001
International Application No. PCT/JP2001/001183
International Filing Date 19.02.2001
Chapter 2 Demand Filed 11.06.2001
IPC
C23C 28/02 2006.01
CCHEMISTRY; METALLURGY
23COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
CCOATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
28Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of main groups C23C2/-C23C26/173
02only coatings of metallic material
CPC
C23C 28/023
CCHEMISTRY; METALLURGY
23COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
CCOATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
28Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
02only coatings ; only including layers; of metallic material
023only coatings of metal elements only
C23C 28/028
CCHEMISTRY; METALLURGY
23COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
CCOATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
28Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
02only coatings ; only including layers; of metallic material
028Including graded layers in composition or in physical properties, e.g. density, porosity, grain size
C25D 3/12
CCHEMISTRY; METALLURGY
25ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
DPROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
3Electroplating: Baths therefor
02from solutions
12of nickel or cobalt
C25D 3/48
CCHEMISTRY; METALLURGY
25ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
DPROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
3Electroplating: Baths therefor
02from solutions
48of gold
C25D 5/12
CCHEMISTRY; METALLURGY
25ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
DPROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
5Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
10Electroplating with more than one layer of the same or of different metals
12at least one layer being of nickel or chromium
Y10S 428/929
YSECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
10TECHNICAL SUBJECTS COVERED BY FORMER USPC
STECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
428Stock material or miscellaneous articles
922Static electricity metal bleed-off metallic stock
9265Special properties
929Electrical contact feature
Applicants
  • IBIDEN CO., LTD. [JP]/[JP] (AllExceptUS)
  • MINAMIKAWA, Yoshihiro [JP]/[JP] (UsOnly)
Inventors
  • MINAMIKAWA, Yoshihiro
Agents
  • OKADO, Akiyoshi
Priority Data
2000-4722124.02.2000JP
2000-4722424.02.2000JP
Publication Language Japanese (JA)
Filing Language Japanese (JA)
Designated States
Title
(EN) NICKEL-GOLD PLATING EXHIBITING HIGH RESISTANCE TO CORROSION
(FR) REVETEMENT A BASE DE NICKEL ET D'OR PRESENTANT UNE GRANDE RESISTANCE A LA CORROSION
Abstract
(EN)
A nickel-gold plating exhibiting high resistance to corrosion, which has a nickel plating layer formed on a base metal (1) and a gold plating layer (3) formed thereon, characterized in that the nickel plating layer (2) has a corrosion potential being brought close to that of the gold plating layer (3) through the reduction of the sulfur content of the nickel plating layer; or which has a first nickel plating layer (6) formed on a base metal, a second nickel plating layer (7) formed on the first nickel plating layer and a gold plating layer formed thereon, characterized in that the first nickel plating layer has a corrosion potential nobler (higher) than that of the second nickel plating layer. The nickel-gold plating exhibits only a mild local cell phenomenon between the gold plating layer and a nickel plating layer directly thereunder even under corrosive conditions, which leads to retardation of the corrosion through pitting and thus to a satisfactory durability of the plating with relatively thin respective plating layers. Accordingly, the nickel-gold plating achieves a high resistance to corrosion with little impairment of production cost or productivity.
(FR)
La présente invention concerne un revêtement à base de nickel et d'or qui présente une résistance élevée à la corrosion et qui comporte une couche de revêtement au nickel formée sur un métal de base (1) et une couche (3) de revêtement à l'or formée sur cette dernière, ce revêtement se caractérisant en ce que la couche (2) de nickel a un potentiel de corrosion qui est rapproché de celui de la couche (3) d'or au moyen de la réduction de la teneur en soufre de la couche de nickel; ou bien ce revêtement comprend une première couche (6) de nickel formée sur un métal de base, une deuxième couche (7) de nickel formée sur la première couche de nickel et une couche d'or formée au-dessus, ce revêtement se caractérisant en ce que la première couche de nickel a un potentiel de corrosion supérieur à celui de la deuxième couche de nickel. Le revêtement au nickel-or présente un phénomène cellulaire local moyen entre la couche d'or et une couche de nickel située directement sous cette dernière dans un milieu agressif, ceci ayant pour effet de retarder la corrosion par piqûres et assurant une durabilité satisfaisante au revêtement avec des couches de revêtement respectives relativement minces. Le revêtement au nickel-or assure ainsi une bonne résistance à la corrosion sans affecter pour autant le coût de production ni la productivité.
Also published as
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